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QCD sum rules are analytic predictions of hadron observables from quantumchromodynamics. In the so-called local-duality limit of their Borel-transformedform, all nonperturbative contributions are encompassed by just a singlequantity, an effective threshold beyond which, by assumption, all hadroniccontributions are reliably described by perturbative QCD. Reconstructing itsquark-mass dependence enables us to investigate the differences of the leptonicdecay constants of heavy-light mesons effectuated by the tiny isospin-violatingdiscrepancy of the masses of up and down quarks. By and large, our findingsenjoy excellent agreement with the outcomes of earlier studies, the onlyexception being a lattice-QCD prediction for the $B$ mesons, where we finddramatic disagreement.

Decay Constants of the Heavy-Light Mesons $D^{(*)}$ and $B^{(*)}$: Isospin Breaking

Decay Constants of the Heavy-Light Mesons $D^{()}$ and $B^{()}$: Isospin Breaking